Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3552684ac25ff9…

MALICIOUS

PDF

81.4 KB Created: 2021-06-09 23:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c818cb78c688b3b89ece0fa644f2e2bd SHA-1: ce5099275db2b63f847f4f4d9600a9c29d93d1e7 SHA-256: 8b3552684ac25ff990e8dad6e2591ed5652bfb88b77b1e5d6ab5705561824996
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document, identified as malicious by ML classifiers and ClamAV, contains numerous links to external websites, many hosted on compromised WordPress installations. The document body, though heavily obfuscated, suggests a lure related to a 'calculator'. The presence of external URIs and link farms indicates an attempt to redirect users to potentially malicious content or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://wastran.ru/uplcv?utm_term=ft+into+meters+calculator PDF link annotation
    • https://brahmagnanam.org/fck_uploads/file/jafogedilifovodi.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/70921968720.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/063a0ab881ee58cbdbcd8080e552be1d/jozizupaxomaruga.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/0e0d2c9deb752be7ae6f8dc4dfdb1f5d/33977754956.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/12386266869.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/51aaa8f6c2b5b327ad56b59ad5482629/61080508049.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2bae47063---kotawuzuxapeven.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/33766901728.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607765af49c8e---53098111042.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6f8268b90---51373342019.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file/%5C/3382513485.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/s0n817706t5glu99lcui6rt25d/35432638657.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/6a00d80bba3cfd06e0ae45f9be8d9bdb/nugepivuvakobunu.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/941cbe9239cc83df3af8582ff25f86df/859147420.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/59432016807.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 4900 bytes
SHA-256: 62989369c1dfc89bb625c335c10448acb1380503bf62e27bcfcf9adcd88df91c
font_01_sfnt_off0000fd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD08 11452 bytes
SHA-256: b0da2a7497b92bcac42eedacf116de678966e19f0d3d0c3d6aebc46ccaff758b
font_02_sfnt_off00012350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12350 16216 bytes
SHA-256: 70f40d70559aacc935f14be6aa78542955531c8ec73b35d0bb8c03e7c63a2f02